=head1 NAME
-[ this is a template for a new perldelta file. Any text flagged as XXX needs
-to be processed before release. ]
-
-perldelta - what is new for perl v5.21.6
+perldelta - what is new for perl v5.21.11
=head1 DESCRIPTION
-This document describes differences between the 5.21.5 release and the 5.21.6
+This document describes differences between the 5.21.10 release and the 5.21.11
release.
-If you are upgrading from an earlier release such as 5.21.4, first read
-L<perl5215delta>, which describes differences between 5.21.4 and 5.21.5.
-
-=head1 Notice
-
-XXX Any important notices here
-
-=head1 Core Enhancements
-
-XXX New core language features go here. Summarize user-visible core language
-enhancements. Particularly prominent performance optimisations could go
-here, but most should go in the L</Performance Enhancements> section.
-
-[ List each enhancement as a =head2 entry ]
-
-=head2 List form of pipe open implemented for Win32
+If you are upgrading from an earlier release such as 5.21.9, first read
+L<perl52110delta>, which describes differences between 5.21.9 and 5.21.10.
-The list form of pipe:
+=head1 Deprecations
- open my $fh, "-|", "program", @arguments;
+=head2 Making all warnings fatal is discouraged
-is now implemented on Win32. It has the same limitations as C<system
-LIST> on Win32, since the Win32 API doesn't accept program arguments
-as a list.
+The documentation for L<fatal warnings|warnings/Fatal Warnings> notes that
+C<< use warnings FATAL => 'all' >> is discouraged and provides stronger
+language about the risks of fatal warnings in general.
-=head1 Security
+=head1 Modules and Pragmata
-XXX Any security-related notices go here. In particular, any security
-vulnerabilities closed should be noted here rather than in the
-L</Selected Bug Fixes> section.
+=head2 Updated Modules and Pragmata
-[ List each security issue as a =head2 entry ]
+=over 4
-=head1 Incompatible Changes
+=item *
-XXX For a release on a stable branch, this section aspires to be:
+L<attributes> has been upgraded from version 0.26 to 0.27.
- There are no changes intentionally incompatible with 5.XXX.XXX
- If any exist, they are bugs, and we request that you submit a
- report. See L</Reporting Bugs> below.
+=item *
-[ List each incompatible change as a =head2 entry ]
+L<B> has been upgraded from version 1.57 to 1.58.
-=head1 Deprecations
-
-XXX Any deprecated features, syntax, modules etc. should be listed here.
+=item *
-=head2 Module removals
+L<B::Deparse> has been upgraded from version 1.34 to 1.35.
-XXX Remove this section if inapplicable.
+C<< <<>> >> is now correctly deparsed.
-The following modules will be removed from the core distribution in a
-future release, and will at that time need to be installed from CPAN.
-Distributions on CPAN which require these modules will need to list them as
-prerequisites.
+=item *
-The core versions of these modules will now issue C<"deprecated">-category
-warnings to alert you to this fact. To silence these deprecation warnings,
-install the modules in question from CPAN.
+L<Config::Perl::V> has been upgraded from version 0.23 to 0.24.
-Note that these are (with rare exceptions) fine modules that you are encouraged
-to continue to use. Their disinclusion from core primarily hinges on their
-necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
-not usually on concerns over their design.
+=item *
-=over
+L<CPAN> has been upgraded from version 2.10 to 2.11.
-=item XXX
+=item *
-XXX Note that deprecated modules should be listed here even if they are listed
-as an updated module in the L</Modules and Pragmata> section.
+L<Cwd> has been upgraded from version 3.55 to 3.56.
-=back
+=item *
-[ List each other deprecation as a =head2 entry ]
+L<ExtUtils::Miniperl> has been upgraded from version 1.04 to 1.05.
-=head2 Use of non-graphic characters in single-character variable names
+=item *
-The syntax for single-character variable names is more lenient than
-for longer variable names, allowing the one-character name to be a
-punctuation character or even invisible (a non-graphic). Perl v5.20
-deprecated the ASCII-range controls as such a name. Now, all
-non-graphic characters that formerly were allowed are deprecated.
-The practical effect of this occurs only when not under C<S<"use
-utf8">>, and affects just the C1 controls (code points 0x80 through
-0xFF), NO-BREAK SPACE, and SOFT HYPHEN.
+L<ExtUtils::ParseXS> has been upgraded from version 3.27 to 3.28.
-=head1 Performance Enhancements
+=item *
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
+L<ExtUtils::Typemaps> has been upgraded from version 3.25 to 3.28.
-[ List each enhancement as a =item entry ]
+=item *
-=over 4
+L<File::Spec> has been upgraded from version 3.55 to 3.56.
=item *
-XXX
+L<if> has been upgraded from version 0.0603 to 0.0604.
-=back
+The documentation now notes that this module also works with C<no>.
-=head1 Modules and Pragmata
+=item *
-XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
-go here. If Module::CoreList is updated, generate an initial draft of the
-following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
-for important changes should then be added by hand. In an ideal world,
-dual-life modules would have a F<Changes> file that could be cribbed.
+L<IO::Socket::IP> has been upgraded from version 0.36 to 0.37.
-[ Within each section, list entries as a =item entry ]
+=item *
-=head2 New Modules and Pragmata
+L<Module::CoreList> has been upgraded from version 5.20150320 to 5.20150420.
-=over 4
+Updated to cover the latest releases of Perl. Also fixes a fencepost error in
+is_core() and copes with versions that do not match x.yyyzzz.
=item *
-XXX
+L<perl5db.pl> has been upgraded from 1.48 to 1.49.
-=back
-
-=head2 Updated Modules and Pragmata
-
-=over 4
+The debugger would cause an assertion failure.
+L<[perl #124127]|https://rt.perl.org/Ticket/Display.html?id=124127>
=item *
-L<IO::Socket> has been upgraded from version 1.37 to 1.38.
-
-Document the limitations of the isconnected() method. [perl #123096]
+L<PerlIO::mmap> has been upgraded from version 0.013 to 0.014.
-=back
+=item *
-=head2 Removed Modules and Pragmata
+L<utf8> has been upgraded from version 1.15 to 1.16.
-=over 4
+Minor documentation update only.
=item *
-XXX
+L<warnings> has been upgraded from version 1.31 to 1.32.
=back
=head1 Documentation
-XXX Changes to files in F<pod/> go here. Consider grouping entries by
-file and be sure to link to the appropriate page, e.g. L<perlfunc>.
-
-=head2 New Documentation
-
-XXX Changes which create B<new> files in F<pod/> go here.
-
-=head3 L<XXX>
-
-XXX Description of the purpose of the new file here
-
=head2 Changes to Existing Documentation
-XXX Changes which significantly change existing files in F<pod/> go here.
-However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
-section.
-
-=head3 L<perldata/Identifier parsing>
+=head3 L<perlebcdic>
=over 4
=item *
-The syntax of single-character variable names has been brought
-up-to-date and more fully explained.
+This document has been significantly updated in the light of recent
+improvements to EBCDIC support.
=back
-=head1 Diagnostics
+=head3 L<perlfunc>
-The following additions or changes have been made to diagnostic output,
-including warnings and fatal error messages. For the complete list of
-diagnostic messages, see L<perldiag>.
+=over 4
-XXX New or changed warnings emitted by the core's C<C> code go here. Also
-include any changes in L<perldiag> that reconcile it to the C<C> code.
+=item *
-=head2 New Diagnostics
+Mention that C<study()> is currently a no-op.
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
+=back
-=head3 New Errors
+=head3 L<perlguts>
=over 4
=item *
-XXX L<message|perldiag/"message">
+The OOK example has been updated to account for COW changes and a change in the
+storage of the offset.
=back
-=head3 New Warnings
+=head3 L<perlhacktips>
=over 4
=item *
-L<Use of literal non-graphic characters in variable names is deprecated|perldiag/"Use of literal non-graphic characters in variable names is deprecated">
+Documentation has been added illustrating the perils of assuming the contents
+of static memory pointed to by the return values of Perl wrappers for C library
+functions doesn't change.
=back
-=head2 Changes to Existing Diagnostics
-
-XXX Changes (i.e. rewording) of diagnostic messages go here
+=head3 L<perlport>
=over 4
=item *
-XXX Describe change here
+Out-of-date VMS-specific information has been fixed/simplified.
=back
-=head1 Utility Changes
-
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
-
-[ List utility changes as a =head2 entry for each utility and =item
-entries for each change
-Use L<XXX> with program names to get proper documentation linking. ]
-
-=head2 L<XXX>
+=head3 L<perluniintro>
=over 4
=item *
-XXX
+Advice for how to make sure your strings and regular expression patterns are
+interpreted as Unicode has been revised to account for the new Perl 5.22 EBCDIC
+handling.
=back
-=head1 Configuration and Compilation
-
-XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
-go here. Any other changes to the Perl build process should be listed here.
-However, any platform-specific changes should be listed in the
-L</Platform Support> section, instead.
-
-[ List changes as a =item entry ].
+=head3 L<perlvms>
=over 4
=item *
-F<Configure> with C<-Dmksymlinks> should now be faster. [perl #122002]
+Out-of-date and/or incorrect material has been removed.
=back
=head1 Testing
-XXX Any significant changes to the testing of a freshly built perl should be
-listed here. Changes which create B<new> files in F<t/> go here as do any
-large changes to the testing harness (e.g. when parallel testing was added).
-Changes to existing files in F<t/> aren't worth summarizing, although the bugs
-that they represent may be covered elsewhere.
-
-[ List each test improvement as a =item entry ]
-
=over 4
=item *
-XXX
+F<t/porting/re_context.t> has been added to test that L<utf8> and its
+dependencies only use the subset of the C<$1..$n> capture vars that
+Perl_save_re_context() is hard-coded to localize, because that function has no
+efficient way of determining at runtime what vars to localize.
=back
=head1 Platform Support
-XXX Any changes to platform support should be listed in the sections below.
+=head2 Platform-Specific Notes
-[ Within the sections, list each platform as a =item entry with specific
-changes as paragraphs below it. ]
+=over 4
-=head2 New Platforms
+=item Win32
-XXX List any platforms that this version of perl compiles on, that previous
-versions did not. These will either be enabled by new files in the F<hints/>
-directories, or new subdirectories and F<README> files at the top level of the
-source tree.
+F<miniperl.exe> is now built with C<-fno-strict-aliasing>, allowing 64-bit
+builds to complete on GCC 4.8.
+L<[perl #123976]|https://rt.perl.org/Ticket/Display.html?id=123976>
-=over 4
+C<test-prep> again depends on C<test-prep-gcc> for GCC builds.
+L<[perl #124221]|https://rt.perl.org/Ticket/Display.html?id=124221>
-=item XXX-some-platform
+=back
-XXX
+=head1 Internal Changes
-=back
+=over 4
-=head2 Discontinued Platforms
+=item *
-XXX List any platforms that this version of perl no longer compiles on.
+Perl 5.21.2 introduced a new build option, C<-DPERL_OP_PARENT>, which causes
+the last C<op_sibling> pointer to refer back to the parent rather than being
+C<NULL>, and where instead a new flag indicates the end of the chain. In this
+release, the new implementation has been revised; in particular:
=over 4
-=item XXX-some-platform
-
-XXX
+=item *
-=back
+On C<PERL_OP_PARENT> builds, the C<op_sibling> field has been renamed
+C<op_sibparent> to reflect its new dual purpose. Since the intention is that
+this field should primarily be accessed via macros, this change should be
+transparent for code written to work under C<PERL_OP_PARENT>.
-=head2 Platform-Specific Notes
+=item *
-XXX List any changes for specific platforms. This could include configuration
-and compilation changes or changes in portability/compatibility. However,
-changes within modules for platforms should generally be listed in the
-L</Modules and Pragmata> section.
+The newly-introduced C<op_lastsib> flag bit has been renamed C<op_moresib> and
+its logic inverted; i.e. it is initialised to zero in a new op, and is changed
+to 1 when an op gains a sibling.
-=over 4
+=item *
-=item XXX-some-platform
+The function C<Perl_op_parent> is now only available on C<PERL_OP_PARENT>
+builds. Using it on a plain build will be a compile-timer error.
-XXX
+=item *
-=back
+Three new macros, C<OpMORESIB_set>, C<OpLASTSIB_set>, C<OpMAYBESIB_set> have
+been added, which are intended to be a low-level portable way to set
+C<op_sibling> / C<op_sibparent> while also updating C<op_moresib>. The first
+sets the sibling pointer to a new sibling, the second makes the op the last
+sibling, and the third conditionally does the first or second action. The
+C<op_sibling_splice()> function is retained as a higher-level interface that
+can also maintain consistency in the parent at the same time (e.g. by updating
+C<op_first> and C<op_last> where appropriate).
-=head3 Win32
+=item *
-=over 4
+The macro C<OpSIBLING_set>, added in Perl 5.21.2, has been removed. It didn't
+manipulate C<op_moresib> and has been superseded by C<OpMORESIB_set> et al.
=item *
-In the experimental C<:win32> layer, a crash in C<open> was fixed. Also
-opening C</dev/null>, which works the Win32 Perl's normal C<:unix> layer, was
-implemented for C<:win32>.
-L<[perl #122224]|https://rt.perl.org/Ticket/Display.html?id=122224>
+The C<op_sibling_splice> function now accepts a null C<parent> argument where
+the splicing doesn't affect the first or last ops in the sibling chain, and
+thus where the parent doesn't need to be updated accordingly.
=back
-=head1 Internal Changes
-
-XXX Changes which affect the interface available to C<XS> code go here. Other
-significant internal changes for future core maintainers should be noted as
-well.
+=back
-[ List each change as a =item entry ]
+=head1 Selected Bug Fixes
=over 4
=item *
-XXX
+C<pack("D", $x)> and C<pack("F", $x)> now zero the padding on x86 long double
+builds. GCC 4.8 and later, under some build options, would either overwrite
+the zero-initialized padding, or bypass the initialized buffer entirely. This
+caused F<op/pack.t> to fail.
+L<[perl #123971]|https://rt.perl.org/Ticket/Display.html?id=123971>
-=back
+=item *
-=head1 Selected Bug Fixes
+Extending an array cloned from a parent thread could result in "Modification of
+a read-only value attempted" errors when attempting to modify the new elements.
+L<[perl #124127]|https://rt.perl.org/Ticket/Display.html?id=124127>
-XXX Important bug fixes in the core language are summarized here. Bug fixes in
-files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
+=item *
-[ List each fix as a =item entry ]
+An assertion failure and subsequent crash with C<< *x=<y> >> has been fixed.
+L<[perl #123790]|https://rt.perl.org/Ticket/Display.html?id=123790>
-=over 4
+=item *
+
+An optimization for state variable initialization introduced in Perl 5.21.6 has
+been reverted because it was found to exacerbate some other existing buggy
+behaviour.
+L<[perl #124160]|https://rt.perl.org/Ticket/Display.html?id=124160>
=item *
-fchmod() and futimes() now set C<$!> when they fail due to being
-passed a closed file handle. [perl #122703]
+The extension of another optimization to cover more ops in Perl 5.21 has also
+been reverted to its Perl 5.20 state as a temporary fix for regression issues
+that it caused.
+L<[perl #123790]|https://rt.perl.org/Ticket/Display.html?id=123790>
=item *
-Perl now comes with a corrected Unicode 7.0 for the erratum issued on
-October 21, 2014 (see L<http://www.unicode.org/errata/#current_errata>),
-dealing with glyph shaping in Arabic.
+New bitwise ops added in Perl 5.21.9 accidentally caused C<$^H |= 0x1c020000>
+to enable all features. This has now been fixed.
-=back
+=item *
+
+A possible crashing/looping bug has been fixed.
+L<[perl #124099]|https://rt.perl.org/Ticket/Display.html?id=124099>
-=head1 Known Problems
+=item *
-XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
-tests that had to be C<TODO>ed for the release would be noted here. Unfixed
-platform specific bugs also go here.
+UTF-8 variable names used in array indexes, unquoted UTF-8 HERE-document
+terminators and UTF-8 function names all now work correctly.
+L<[perl #124113]|https://rt.perl.org/Ticket/Display.html?id=124113>
-[ List each fix as a =item entry ]
+=item *
-=over 4
+Breakage in C<require(VERSION)> (with parentheses), introduced in Perl 5.21.6,
+has been fixed.
+L<[perl #124135]|https://rt.perl.org/Ticket/Display.html?id=124135>
=item *
-Starting in 5.21.6, accessing L<perlapi/CvPADLIST> in an XSUB is forbidden.
-CvPADLIST has be reused for a different internal purpose for XSUBs. Guard all
-CvPADLIST expressions with C<CvISXSUB()> if your code doesn't already block
-XSUB CV*s from going through optree CV* expecting code.
+Wide char warnings, wrongly raised in UTF-8 locales since Perl 5.21.8, are now
+suppressed.
+L<[perl #123527]|https://rt.perl.org/Ticket/Display.html?id=123527>
-=back
+=item *
-=head1 Errata From Previous Releases
+A subtle bug introduced in Perl 5.21.4 involving UTF-8 in regular expressions
+and sometimes causing a crash has been fixed. A new test script has been added
+to test this fix; see under L</Testing>.
+L<[perl #124109]|https://rt.perl.org/Ticket/Display.html?id=124109>
-=over 4
+=item *
+
+A change introduced in Perl 5.21.10 that broke the autovivification CPAN module
+has been reverted.
=item *
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+A bug whereby C<< 'FOO'->f() >> lost the read-only status of C<FOO>, introduced
+in Perl 5.21.7, has been fixed.
+L<[perl #123619]|https://rt.perl.org/Ticket/Display.html?id=123619>
-=back
+=item *
-=head1 Obituary
+A regression in Perl 5.21 in the matching of C</[A-Z]/ai> has been fixed.
-XXX If any significant core contributor has died, we've added a short obituary
-here.
+=back
=head1 Acknowledgements
-XXX Generate this with:
+Perl 5.21.11 represents approximately 4 weeks of development since Perl 5.21.10
+and contains approximately 5,800 lines of changes across 240 files from 24
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 1,700 lines of changes to 160 .pm, .t, .c and .h files.
+
+Perl continues to flourish into its third decade thanks to a vibrant community
+of users and developers. The following people are known to have contributed
+the improvements that became Perl 5.21.11:
+
+Alex Vandiver, Andreas König, Craig A. Berry, Dagfinn Ilmari Mannsåker, Daniel
+Dragan, David Golden, David Mitchell, Father Chrysostomos, H.Merijn Brand,
+Herbert Breunung, Hugo van der Sanden, James E Keenan, James McCoy, Karl
+Williamson, Matthew Horsfall, Max Maischein, Nicholas Clark, Rafael
+Garcia-Suarez, Randy Stauner, Ricardo Signes, Shirakata Kentaro, Steffen
+Müller, Steve Hay, Tony Cook.
+
+The list above is almost certainly incomplete as it is automatically generated
+from version control history. In particular, it does not include the names of
+the (very much appreciated) contributors who reported issues to the Perl bug
+tracker.
+
+Many of the changes included in this version originated in the CPAN modules
+included in Perl's core. We're grateful to the entire CPAN community for
+helping Perl to flourish.
- perl Porting/acknowledgements.pl v5.21.5..HEAD
+For a more complete list of all of Perl's historical contributors, please see
+the F<AUTHORS> file in the Perl source distribution.
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff